Biomechanical properties of three internal fixation methods for distal humeral shaft fractures: a finite element analysis
10.3760/cma.j.cn115530-20240424-00183
- VernacularTitle:三种内固定方式固定肱骨干下段骨折生物力学特性的有限元分析
- Author:
Gang FU
1
;
Renbin LI
;
Xinyu TAO
;
Guilin LI
;
Hui GE
;
Jianlong CHEN
;
Xuchao LIN
;
Peisheng CHEN
;
Fengfei LIN
Author Information
1. 福州市第二总医院创伤骨科，福建医科大学教学医院，福建医科大学临床医学部，福州 350007
- Keywords:
Humeral fractures;
Fracture fixation;
Finite element analysis;
Bone plates;
Stress peak;
Displacement peak
- From:
Chinese Journal of Orthopaedic Trauma
2024;26(11):991-996
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To compare the biomechanical properties of posterolateral distal humeral plate, inverted anterior proximal humerus internal locking system (PHILOS), and anterior reconstruction plate in the treatment of distal humeral shaft fractures by a finite element analysis.Methods:One healthy adult male volunteer, aged 27 years, with a height of 171 cm and a weight of 70 kg, was recruited for this study. The finite element method was used to establish a simulation model of distal humeral shaft fracture. The maximum displacement and maximum stress were compared between fixation with posterolateral distal humeral plate (group A), fixation with inverted anterior PHILOS (group B), and fixation with anterior reconstruction plate (group C).Results:In groups A, B, and C, respectively, the overall stress peak values were 409.07 MPa, 217.04 MPa, and 370.64 MPa; the peak stresses under torsional load were 234.55 MPa, 348.80 MPa and 458.17 MPa; the overall stress peaks under bending load were 250.22 MPa, 466.76 MPa, and 582.32 MPa. The smaller the stress, the smaller the risk of fatigue fracture. In groups A, B, and C, respectively, the overall displacement peak values were 5.18 mm, 3.04 mm and 3.75 mm; the peak displacements under torsional load were 1.20 mm, 1.02 mm and 2.05 mm; the peak displacements under bending load were 3.85 mm, 5.28 mm and 9.04 mm. The smaller the displacement, the better the fixation stability.Conclusions:In the treatment of distal humeral shaft fractures, fixation with inverted anterior PHILOS leads to the best mechanical stability under axial compression and torsional stress, while fixation with the posterolateral distal humeral plate leads to the best mechanical stability under bending stress.
